Hydrostatic pulling
Input(s)
NS: Number of Stands Pulled (number)
Lavg: Average length per stand \((\mathrm{ft})\)
PD: Pipe Displacement (bbl/ft)
mw: Mud Weight (ppg)
cc: Casing Capacity (bbl/ft)
pd: Pipe Disp. (bbl/ft)
Output(s)
BD: Barrel Displaced (bbl)
HP: Hydrostatic Pressure Decrease (Pulling Dry Pipe out of the Hole) (psi)
Formula(s)
\[
\begin{gathered}
B D=N S * L a v g * P D \\
H P=B D * 0.052 * \frac{m w}{c c-p d}
\end{gathered}
\]
Reference(s)
Formulas and Calculations for Drilling, Production and Workover, Second Edition, Lapeyrouse, Page: 20.